H Y Ramirez et al 2007 J. Phys.: Condens. Matter 19 346216 doi:10.1088/0953-8984/19/34/346216
Influence of shape and electric field on electron relaxation and coherent response in quantum-dot molecules
H Y Ramirez1,3, A S Camacho1 and L C Lew Yan Voon2
Show affiliationsWe studied the effects of the confinement geometry and of external electric field on the electron dynamics of spherical and cylindrical double quantum dots. With an effective-mass approach, we found eigenenergies and envelope wave functions for finite confinement numerically. Using these energy states, we studied the response of the system to electric field pulses of different intensities, by calculating the density-matrix evolution in the high-delocalization regime, considering electron–electron and electron–acoustic phonon interactions, as a function of external DC electric field in the coupling direction. We obtained suitable conditions for coherent emission from cylindrically shaped dots, while in the case of spherically shaped dots, the scattering process is faster than the quantum beat oscillation.
- PACS
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71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 34 (29 August 2007)
Received 13 April 2007, in final form 20 June 2007
Published 24 July 2007
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Influence of shape and electric field on electron relaxation and coherent response in quantum-dot molecules
H Y Ramirez et al 2007 J. Phys.: Condens. Matter 19 346216
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